Salmonella Typhi (which causes typhoid fever) differs from nontyphoidal Salmonella mainly because it:
a.Is excluded from the Big 6 because it is rarely dangerous
b.Is carried only by cattle and poultry that shed it into raw meat
c.Lives only in humans and is spread by infected food handlers
d.Is destroyed by refrigerating ready-to-eat food at 41°F or below
Explanation
Salmonella Typhi lives only in humans — there is no animal reservoir — and it spreads when an infected food handler contaminates food or drink, which is why that worker is excluded until a medical release clears them. It is one of the Big 6 reportable pathogens precisely because typhoid fever is severe. Refrigerating at 41°F slows bacterial growth but destroys nothing, and typhoid fever is a human disease, so cattle and poultry are not its source.
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